Paleo-Karstification in Carbonates of 4th Member of Middle Triassic Leikoupo Formation in Northeastern Sichuan Basin and Its Petroleum Geological Significance
详细信息
- 责任者：Ma Zhiluan (College of Tourism and Urban-Rural Planning ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Chen Hongde
- 刊名：Geological Bulletin of China
- 出版年：2012
- 卷期：31(4)
- 关键词：碳酸盐岩储集层 ; carbonate reservoirs ; 四川盆地 ; Sichuan Basin
- 页码：p.577-585
- 图表：4 illus., 1 plate, 19 refs.
- 分类号：1001
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
摘要
The hydrocarbon breakthrough in the 4th member of the Leikoupo Formation shows important geological significance for petroleum exploration. Based on comprehensive analysis composed of outcrop and drill-core observations, thin-section petrographic examinations, well log analysis, fluid inclusion studies, and carbon, oxygen, strontium isotopic composition measurements, the authors divided paleokarst faces of the study area into six types, i.e., surface eluvium, speleothem composed of break-down clasts, fillings from underground rivers, crack of base rock,solution of base rock, and dissolution and replacement of base rock. Using the impression method and based on the distribution characteristics of relict stratum, the authors restored palaeokarst geomorphology for the 4th Member of the Leikoupo Formation and presented more details of micro-geomorphology for Yuanba area.